mitt romney is in boston. both agree it's upon the president to improve on his performance in the next debate. nbc's tracie potts live on capitol hill with more. >> reporter: good morning. the president apparently agrees with it. he saw the tape of the last debate, was pretty disappointed, and does not plan to make the same mistakes again. tomorrow the president's been down in williamsburg practicing for this next one on tomorrow. not a lot of details about specifically what he's studying other than aides saying he'll be a lot more aggressive and energetic than we saw two weeks ago. mitt romney, who went to church with his family yesterday, has been doing debate prep himself on the road, ready to face what aides say will be, from the president, a new strategy. >> we saw governor romney sort of serially walk away from his own proposals, and certainly the president is going to be willing to challenge him on it. >> the president can change his style. he can change his tactics. he can't change his record, and he c